湘鄂西地区五峰-龙马溪组页岩地层与沉积特征  

Stratigraphic and Sedimentary Characteristics of Wufeng-Longmaxi Formation in the Western Hunan-Hubei Region

作　　者：姚明君[1] 包汉勇[1] 丁青[1] 龙幼康[1] 刘超[1] 王艳春[1] YAO Ming-Jun;BAO Han-Yong;DING Qing;LONG You-Kang;LIU Chao;WANG Yan-Chun(Exploration and Development Research Institute Sinopec Jianghan Oilfield, Wuhan 430223, Hubei,China)

机构地区：[1]中石化江汉油田勘探开发研究院,武汉430223

出　　处：《华南地质与矿产》2016年第2期191-197,共7页Geology and Mineral Resources of South China

摘　　要：以湘鄂西及周缘地区晚奥陶世至早志留世沉积的泥页岩为研究对象,本文通过钻井取心测井、野外观察和分析化验等资料,分析了研究区五峰-龙马溪组页岩的发育和沉积特征。结果表明,湘鄂西地区页岩普遍厚40-60m,纵向上可划分为三亚段,九小层,其中1亚段对应底部1-5小层,为高伽马值(GR),低密度,高有机质丰度的页岩段,以灰黑色—黑色硅质-炭质页岩为主,湘鄂西古隆起及周缘1-5小层页岩段有不同程度的缺失。页岩纵向上发育深水硅质陆棚、深水砂质陆棚、深水混积陆棚和深水泥质陆棚4种沉积微相,其中1-5小层页岩段对应深水硅质陆棚微相,为缺氧的强还原沉积环境,沉积了富含笔石、黄铁矿的富硅、富碳页岩,其硅质多为自生成因,对应焦石坝目前的主力产气页岩段。Take the shale which deposited in late Ordovician to early Silurian in western Hunan and Hubei region as this research object, based on the observation of field and core, the analysis of well-logging and samples, it studied the stratigraphic development and sedimentary characteristics of Wufeng-Longmaxi Formation in this area. Results indicate that, the thickness of shale in western Hunan and Hubei region is between 40 and 60 m, the shale can divided into 3 sub-members and 9 sub-layers, 1 sub-member,corresponds to 1-5 sub-layer, with the characteristics of high gamma value(GR), low density and high organic matter abundance, mainly with ash black-black siliceous-carbonaceous shale. The shale member of the palaeohigh and peripheral 1-5 sub-layers in western Hunan and Hubei region had absent in different degrees. It had developed 4 sedimentary microfacies,such as deepwater siliceous continental shelf, deep water arenaceous continental shelf, deep water diamictic continental shelf and deepwater argillaceous continental shelf. Among of them, the shale member in 1-5sub-layers, is corresponds to deepwater siliceous continental shelf,with anoxic strongly reducing sedimentary environment, deposited of rich graptolite, rich silicon in pyrite, and rich carbon shale, its silicious is authigenic origin,this shale member is the currently main gas yield member.

关 键 词：沉积微相 页岩地层 五峰-龙马溪组 湘鄂西地区 

分 类 号：P534.42[天文地球—古生物学与地层学] P534.43[天文地球—地质学]